US 2006/0050643 A1 · Router for multicast redundant routing and system for multicast redundancy

Abstract

In the IGMP/MLD Proxy, a link to an upper router must be formed in a tree structure. However, in this case, if a fault is generated in the link to the upper router, multicasts to the lower networks are all disabled. Plural links to the upper router may be set up using a routing protocol such as PIM, but light and easier operations of the IGMP/MLD Proxy are lost. In view of solving this problem, alternative links may be set in addition to the links which are usually used as the links to the upper router. Usually, the IGMP/MLD is exchanged only with the links which are usually used but with the alternative link. If link-off is detected in the link to the upper router used generally, the IGMP Membership Report/MLD Listener Report packet is transmitted to the side of the alternative link and thereafter the upper link is switched through exchanges of the IGMP/MLD only with the side of the alternative link.

Claims9

Dependent claims

A IGMP/MLD Proxy router comprising:

a memory for storing the upper link information and the alternative upper link information,
a processor for controlling routing,
a line unit physically connected to an upper link and an alternative upper link to make communications in accordance with control of said processor, and
an internal transfer unit for connecting said memory, processor, and line unit,
whereby said processor can transmit the IGMP/MLD Report to said alternative upper link when a fault in said upper link is detected and thereafter executes the control for switching said upper router by sending a response to the Query from said alternative upper link.

2 more elements

Dependencies are inferred from the claim text.

Router for multicast redundant routing and system for multicast redundancy

Life of this patent

Router for multicast redundant routing and system for multicast redundancy

Life of this patent

Abstract

Claims9